如何在JavaScript数组中添加/替换内部对象

let array = [];
let obj = { name: "John", age: 25 };
array.push(obj);

let array = [{ name: "John", age: 25 }, { name: "Jane", age: 30 }];
let newObj = { name: "Alice", age: 35 };
array[1] = newObj;

let array = [{ name: "John", age: 25 }, { name: "Jane", age: 30 }];
let newObj = { name: "Alice", age: 35 };
array.splice(1, 1, newObj);

let array = [{ name: "John", age: 25 }];
let newArray = [{ name: "Jane", age: 30 }, { name: "Alice", age: 35 }];
array = array.concat(newArray);